package com.tianji.learning.service.impl;

import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.tianji.api.cache.CategoryCache;
import com.tianji.api.client.course.CatalogueClient;
import com.tianji.api.client.course.CourseClient;
import com.tianji.api.client.search.SearchClient;
import com.tianji.api.client.user.UserClient;
import com.tianji.api.dto.course.CataSimpleInfoDTO;
import com.tianji.api.dto.course.CourseSimpleInfoDTO;
import com.tianji.api.dto.user.UserDTO;
import com.tianji.common.domain.dto.PageDTO;
import com.tianji.common.exceptions.BadRequestException;
import com.tianji.common.exceptions.BizIllegalException;
import com.tianji.common.utils.BeanUtils;
import com.tianji.common.utils.CollUtils;
import com.tianji.common.utils.StringUtils;
import com.tianji.common.utils.UserContext;
import com.tianji.learning.domain.dto.QuestionFormDTO;
import com.tianji.learning.domain.po.InteractionQuestion;
import com.tianji.learning.domain.po.InteractionReply;
import com.tianji.learning.domain.query.QuestionAdminPageQuery;
import com.tianji.learning.domain.query.QuestionPageQuery;
import com.tianji.learning.domain.vo.QuestionAdminVO;
import com.tianji.learning.domain.vo.QuestionVO;
import com.tianji.learning.mapper.InteractionQuestionMapper;
import com.tianji.learning.service.IInteractionQuestionService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.tianji.learning.service.IInteractionReplyService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collectors;

/**
 * <p>
 * 互动提问的问题表 服务实现类
 * </p>
 *
 * @author author
 * @since 2025-01-23
 */
@Service
@RequiredArgsConstructor
@Slf4j
public class InteractionQuestionServiceImpl extends ServiceImpl<InteractionQuestionMapper, InteractionQuestion> implements IInteractionQuestionService {

    private final IInteractionReplyService replyService;
    private final UserClient userClient;
    private final SearchClient searchClient;
    private final CourseClient courseClient;
    private final CatalogueClient catalogueClient;
    private final CategoryCache categoryCache;
    /**
     * 新增互动问题
     * @param dto
     */
    @Override
    public void saveQuestion(QuestionFormDTO dto) {
        //1.获取当前登录id
        Long userId = UserContext.getUser();

        //2.dto转po
        InteractionQuestion question = BeanUtils.copyBean(dto, InteractionQuestion.class);
        question.setUserId(userId);

        //3.保存
        this.save(question);
    }

    /**
     * 修改互动问题
     * @param id
     * @param dto
     */
    @Override
    public void updateQuestion(Long id, QuestionFormDTO dto) {
        //1.校验
        if (StringUtils.isBlank(dto.getTitle()) || StringUtils.isBlank(dto.getDescription()) || dto.getAnonymity() == null){
            throw new BadRequestException("非法参数");
        }
        //校验id
        InteractionQuestion question = this.getById(id);
        if (question==null){
            throw new BadRequestException("非法参数");
        }
        //只能修改自己的互动问题
        Long userId = UserContext.getUser();
        if (!userId.equals(question.getUserId())){
            throw new BadRequestException("不能修改别人的互动问题");
        }

        //2.dto 转 po
        question.setTitle(dto.getTitle());
        question.setDescription(dto.getDescription());
        question.setAnonymity(dto.getAnonymity());

        //3.修改
        this.updateById(question);
    }


    /**
     * 分页查询互动问题-用户端
     * @param query
     * @return
     */
    @Override
    public PageDTO<QuestionVO> queryQuestionPage(QuestionPageQuery query) {
        //1.校验课程id
        if (query.getCourseId()==null){
            throw new BadRequestException("课程id不能为空");
        }

        //2.获取用户id
        Long userId = UserContext.getUser();

        //3.分页查询互动问题interaction_question
        // 条件course_id  onlyMine为true才会加userid  小节id不为空  hidden为false 分页查询 按提问时间倒叙
        Page<InteractionQuestion> page = this.lambdaQuery()
                .select(InteractionQuestion.class, info -> !info.getProperty().equals("description"))
                .eq(InteractionQuestion::getCourseId, query.getCourseId())
                .eq(query.getOnlyMine(), InteractionQuestion::getUserId, userId)
                .eq(query.getSectionId() != null, InteractionQuestion::getSectionId, query.getSectionId())
                .eq(InteractionQuestion::getHidden, false)
                .page(query.toMpPageDefaultSortByCreateTimeDesc());
        List<InteractionQuestion> records = page.getRecords();
        if (CollUtils.isEmpty(records)) {
            return PageDTO.empty(page);
        }

        Set<Long> latestAnswerIds = new HashSet<>();//最新回答id集合
        Set<Long> userIds = new HashSet<>();//互动问题的用户id集合
        for (InteractionQuestion record : records) {
            if (!record.getAnonymity()){//如果用户是匿名提问，则不显示用户名和头像
                userIds.add(record.getUserId());
            }

            if (record.getLatestAnswerId()!= null){
                latestAnswerIds.add(record.getLatestAnswerId());
            }
        }
        //4.根据最新回答id 批量查询回答信息interaction_replay    in id集合
        Map<Long,InteractionReply> replyMap = new HashMap<>();
        if (CollUtils.isNotEmpty(latestAnswerIds)){//集合有可能为空，需要非空校验
           // List<InteractionReply> replyList = replyService.listByIds(latestAnswerIds);
            List<InteractionReply> replyList = replyService.list(Wrappers.<InteractionReply>lambdaQuery()
                    .in(InteractionReply::getId, latestAnswerIds)
                    .eq(InteractionReply::getHidden, false));

            for (InteractionReply reply : replyList) {
                if (!reply.getAnonymity()){
                    userIds.add(reply.getUserId());
                }
                replyMap.put(reply.getId(),reply);
            }
        }

        //5.远程调用用户服务 获取用户信息 批量
        List<UserDTO> userDTOS = userClient.queryUserByIds(userIds);
        Map<Long, UserDTO> userDTOMap = userDTOS.stream().collect(Collectors.toMap(UserDTO::getId, c -> c));


        //6.封装vo返回
        List<QuestionVO> voList = new ArrayList<>();
        for (InteractionQuestion record : records) {
            QuestionVO vo = BeanUtils.copyBean(record, QuestionVO.class);
            if (!vo.getAnonymity()) {
                UserDTO userDTO = userDTOMap.get(record.getUserId());
                if (userDTO!=null){
                    vo.setUserName(userDTO.getName());
                    vo.setUserIcon(userDTO.getIcon());
                }
            }

            InteractionReply reply = replyMap.get(record.getLatestAnswerId());
            if (reply != null){
                UserDTO userDTO = userDTOMap.get(reply.getUserId());
                if (!reply.getAnonymity()){ //最新回答如果是非匿名，才设置最新回答者昵称
                    vo.setLatestReplyUser(userDTO.getName());
                }
                vo.setLatestReplyContent(reply.getContent());
            }

            voList.add(vo);
        }
            return PageDTO.of(page,voList);
    }

    /**
     * 查询问题详情-用户端
     * @param id
     * @return
     */
    @Override
    public QuestionVO queryQuestionById(Long id) {
        //1.校验
        if (id==null){
            throw new BadRequestException("非法参数");
        }

        //2.查询互动问题表 按主键查询
        InteractionQuestion question = this.getById(id);
        if (question==null){
            throw new BadRequestException("问题不存在");
        }

        //3.如果该问题管理员设置了隐藏 返回null
        if (question.getHidden()){
            return null;
        }
        //4.封装vo返回
        QuestionVO questionVO = BeanUtils.copyBean(question, QuestionVO.class);

        //5.如果用户是匿名提问，不用查询提问者昵称和头像
        if (!question.getAnonymity()){
            UserDTO userDTO = userClient.queryUserById(question.getUserId());
            if (userDTO != null) {
                questionVO.setUserName(userDTO.getName());
                questionVO.setUserIcon(userDTO.getIcon());
            }
        }
        return questionVO;
    }

    /**
     * 分页查询问题列表-管理端
     * @param query
     * @return
     */
    @Override
    public PageDTO<QuestionAdminVO> queryQuestionAdminVOPage(QuestionAdminPageQuery query) {
        //如果用户传了课程名称的参数，则从es中获取该名称对应的课程id
        String courseName = query.getCourseName();
        List<Long> cids = null;
        if (StringUtils.isNotBlank(courseName)){
            cids = searchClient.queryCoursesIdByName(courseName);//通过feign远程调用搜索服务，从es中获取该名称对应的课程id
            if (CollUtils.isEmpty(cids)){
                return PageDTO.empty(0L,0L);
            }
        }

        //1.查询互动问题表  条件 前端传条件了就添加条件 分页 排序（提问时间倒序）
        Page<InteractionQuestion> page = this.lambdaQuery()
                .in(CollUtils.isNotEmpty(cids),InteractionQuestion::getCourseId, cids)
                .eq(query.getStatus() != null, InteractionQuestion::getStatus, query.getStatus())
                .between(query.getBeginTime() != null && query.getEndTime() != null,
                        InteractionQuestion::getCreateTime, query.getBeginTime(), query.getEndTime())
                .page(query.toMpPageDefaultSortByCreateTimeDesc());
        List<InteractionQuestion> records = page.getRecords();
        if (CollUtils.isEmpty(records)){
            return PageDTO.empty(0L,0L);
        }

        Set<Long> uids = new HashSet<>();//用户id集合
        Set<Long> courseids = new HashSet<>();//课程id集合
        Set<Long> chapterAndSectionIds = new HashSet<>();//章节id集合
        for (InteractionQuestion record : records) {
            uids.add(record.getUserId());
            courseids.add(record.getCourseId());
            chapterAndSectionIds.add(record.getChapterId());
            chapterAndSectionIds.add(record.getSectionId());
        }
        //2.远程调用用户服务，获取用户信息
        List<UserDTO> userDTOS = userClient.queryUserByIds(uids);
        if (CollUtils.isEmpty(userDTOS)){
            throw new BizIllegalException("用户不存在");
        }
        Map<Long, UserDTO> userDTOMap = userDTOS.stream().collect(Collectors.toMap(UserDTO::getId, c -> c));

        //3.远程调用课程服务，获取课程信息
        List<CourseSimpleInfoDTO> cinfos = courseClient.getSimpleInfoList(courseids);
        if (CollUtils.isEmpty(cinfos)){
            throw new BizIllegalException("课程不存在");
        }
        Map<Long, CourseSimpleInfoDTO> cinfoMap = cinfos.stream().collect(Collectors.toMap(CourseSimpleInfoDTO::getId, c -> c));

        //4.远程调用课程服务，获取章节信息
        List<CataSimpleInfoDTO> cataSimpleInfoDTOS = catalogueClient.batchQueryCatalogue(chapterAndSectionIds);
        if (CollUtils.isEmpty(cataSimpleInfoDTOS)){
            throw new BizIllegalException("章节信息不存在");
        }
        Map<Long, String> cataInfoDTO = cataSimpleInfoDTOS.stream().collect(Collectors.toMap(CataSimpleInfoDTO::getId, c -> c.getName()));


        //6.po转vo
        List<QuestionAdminVO> voList = new ArrayList<>();
        for (InteractionQuestion record : records) {
            QuestionAdminVO adminVO = BeanUtils.copyBean(record,QuestionAdminVO.class);
            UserDTO userDTO = userDTOMap.get(record.getUserId());
            if (userDTO != null){
                adminVO.setUserName(userDTO.getName());
            }

            CourseSimpleInfoDTO cinfoDTO = cinfoMap.get(record.getCourseId());
            if (cinfoDTO != null){
                adminVO.setCategoryName(cinfoDTO.getName());
                List<Long> categoryIds = cinfoDTO.getCategoryIds();//123级分类id集合
                //5.获取分类信息
                String categoryNames = categoryCache.getCategoryNames(categoryIds);
                adminVO.setCategoryName(categoryNames);//三级分类名称
            }
            adminVO.setChapterName(cataInfoDTO.get(record.getChapterId()) == null ? "" : cataInfoDTO.get(record.getChapterId()));
            adminVO.setSectionName(cataInfoDTO.get(record.getSectionId()));

            voList.add(adminVO);
        }
        return PageDTO.of(page,voList);
    }
}
